243197745 has 32 divisors (see below), whose sum is σ = 464044032. Its totient is φ = 106341312.

The previous prime is 243197737. The next prime is 243197749. The reversal of 243197745 is 547791342.

It is not a de Polignac number, because 243197745 - 2³ = 243197737 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243197697 and 243197706.

It is not an unprimeable number, because it can be changed into a prime (243197749) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47937 + ... + 52766.

It is an arithmetic number, because the mean of its divisors is an integer number (14501376).

Almost surely, 2^243197745 is an apocalyptic number.

It is an amenable number.

243197745 is a deficient number, since it is larger than the sum of its proper divisors (220846287).

243197745 is a wasteful number, since it uses less digits than its factorization.

243197745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100741.

The product of its digits is 211680, while the sum is 42.

The square root of 243197745 is about 15594.7986521147. The cubic root of 243197745 is about 624.1943710521.

The spelling of 243197745 in words is "two hundred forty-three million, one hundred ninety-seven thousand, seven hundred forty-five".